CN102644913A - Residual heat utilization method of cooling water for black liquor recovery boiler chute and system thereof - Google Patents
Residual heat utilization method of cooling water for black liquor recovery boiler chute and system thereof Download PDFInfo
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- CN102644913A CN102644913A CN2012101253978A CN201210125397A CN102644913A CN 102644913 A CN102644913 A CN 102644913A CN 2012101253978 A CN2012101253978 A CN 2012101253978A CN 201210125397 A CN201210125397 A CN 201210125397A CN 102644913 A CN102644913 A CN 102644913A
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- cooling water
- water
- chute
- desalination
- recovery boiler
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Abstract
The invention discloses a residual heat utilization method of cooling water for a black liquor recovery boiler chute and a system of the residual heat utilization method of cooling water for black liquor recovery boiler chute. According to the invention, the black liquor recovery boiler chute is subjected to cool when desalting cooling water passes through the alkali recovery boiler chute, then the conductivity of the desalting cooling water after heat exchange is detected; when the conductivity of the desalting cooling water after heat exchange is not larger than a set value, the desalting cooling water after heat exchange is transmitted to a boiler so as to supplement preheating water for the boiler; when the conductivity of the desalting cooling water after heat exchange is larger than the set value, the desalting cooling water after heat exchange is recycled or treated and discharged. The method and the system provided by the invention have the advantages that no cooling heat exchanger for circulating cooling water is used and the residual heat of the cooling water after heat exchange is well used; therefore, the method is simple in flow, the system equipment is simple, small space is occupied, the investment is low, and the operating cost is low; moreover, the method and the system are easy to control.
Description
Technical field
The invention belongs to pulping and paper-making industry alkali and reclaim furnace room alkali recovery boiler chute cooling water technology, be specifically related to a kind of alkali recovery boiler chute cooling water heat utilization technology.
Background technology
The pulping and paper-making industry is that China's emphasis pollutes one of industry; By the black liquor that produces in the pulping process is the major pollution source; Present domestic and international application technology the most widely is an alkali recycling technology, and wherein the alkali recovery boiler occupy the core link of alkali recycling technology.From the fusion ash of furnace bottom discharge high temperature, the fusion ash will be sent into dissolving tank through chute and recycle after black liquor burnt in the alkali recovery boiler.The cooling of chute realizes through water-cooled; Chute is one of key equipment of alkali recovery boiler, in case chute damages, will be compelled blowing out to repair or replace.Fusant chute cooling medium generally adopts common clear water or demineralized water (demineralized water) at present.The most domestic pulp mill generally adopts common clear water to carry out the chute cooling; Mainly be because of the clear water convenient sources, but, can cause the fouling of chute inner surface after long-term the use because the hardness of clear water is higher; Influence cooling effect; Cause chute to damage easily, even have the clear water after part factory will use directly to drain, both wasted water resource and also wasted heat energy.External and domestic newly-built pulp mill generally adopt the chute cooling technology among " recommend method of alkali recovery boiler black liquor safe combustion " (RECOMMENDED GOOD PRACTICE SAFE FIRING OF BLACK LIQUOR IN BLACK LIQUOR RECOVERY BOILERS) that North America " alkali recovery boiler Advisory Board " (THE BLACK LIQUOR RECOVERY BOILER ADVISORY COMMITTEE) formulates; This technology is that the cooling water with chute is designed to closed cycle; Adopt demineralized water as cooling medium; Comprise water circulating pump, elevated tank, recirculated cooling water cooling heat exchanger, cyclic water tank, automatic instrument(s) and valve etc.; Its method is at first utilized between cooling water and the chute of desalination and is carried out heat exchange; This system lock property is good, and is safe and reliable, and long-time running chute inner surface is non flouling behaviour also.The method that this system implements cooling to chute is: the cooling water of the desalination of the heat after the heat exchange cools off through the recirculated cooling water cooling heat exchanger again, recycles again.This system exists system complex, high, high, the unserviceable shortcoming of waste heat of operating cost of investment, and this system exists and can easily not detect whether leakage problems of chute simultaneously.
Summary of the invention
The object of the present invention is to provide a kind of recirculated cooling water cooling heat exchanger that need not, realize that the heat energy in the cooling water of desalination utilizes again, and whether chute is leaked the alkali recovery boiler chute cooling water heat of implementing to detect utilize method and system thereof; To address the above problem.
Alkali recovery boiler chute cooling water heat of the present invention utilizes method: be with the desalination cooling water implement through alkali recovery boiler chute after to the chute cooling, detect the desalination cooling electrical conductivity of water after the heat exchange; When the cooling of the desalination after heat exchange electrical conductivity of water is not more than setting value, the desalination cooling water after the described heat exchange is transported to boiler, boiler is replenished preheating water; When the desalination after the heat exchange cools off electrical conductivity of water greater than setting value, the desalination cooling water after the described heat exchange is reclaimed or administers discharging.
The water temperature of desalination cooling water is not more than 30 ℃; The water temperature of the desalination cooling water after the heat exchange is not more than 60 ℃.
The water temperature control of the desalination cooling water after the heat exchange realizes through control discharge.
Alkali recovery boiler chute cooling water heat of the present invention utilizes system; It comprises alkali recovery boiler water-cooled chute; The cooling water inlet pipe of water-cooled chute connects UNICOM's desalination cooling water supply pipe; The outlet pipe of water-cooled chute connects UNICOM's water pump, outlet conduit parallel connection first outlet conduit and second outlet conduit that is used for boiler is replenished preheating water of water pump; The outlet conduit of water pump is provided with the conductance instrument that is used to detect heat exchange desalination cooling water electrical conductivity afterwards; The output signal conveys of conductance instrument is to logic controller, and the output control signal of logic controller is transported to first control valve and second control valve of second outlet conduit on first outlet conduit respectively.
The desalination cooling water supply pipe is provided with the flow control valve and first stop valve.
Establish water inlet water temperature detector on the desalination cooling water supply pipe; The outlet pipe upper water-out water temperature detector of the heat-exchange device of alkali recovery boiler chute.
Be connected with second stop valve on the pipeline of the water inlet end of first control valve; Be connected with the 3rd stop valve on the pipeline of the water inlet end of second control valve.
The setting value of desalination cooling water electrical conductivity is meant that meeting boiler uses electrical conductivity of water; National standard has regulation, according to the difference of boiler pressure the Different control standard is arranged.
The invention solves the technical problem that can't recycle of waste heat of chute fouling and cooling chute, following advantage and improvement arranged than other technical scheme:
1. adopt demineralized water cooling chute, avoid the problem of chute inner surface fouling, improve the cooling effect of chute, prolong chute service life.
2. come the cooling water whereabouts after the gauge tap valve is selected heat exchange through conductance instrument on-line measurement cooling water conductivity values; If electrical conductivity is qualified; Then cooling water is sent to boiler feed water system, can makes full use of waste heat like this, reduce the boiler feedwater preheating and use steam consumption quantity; If electrical conductivity exceeds standard, explain chute have leak or the cooling water quality defective, can operate operation to the operations staff of factory reference data is provided.
3, because this system does not have the recirculated cooling water cooling heat exchanger, make full use of the waste heat of the cooling water after the heat exchange simultaneously, therefore, this method flow is simple, and system equipment is simple, and it is little to take up room, small investment, and operating cost is low; Be easy to control simultaneously.
Description of drawings
Fig. 1 alkali recovery boiler chute cooling water heat utilizes system schematic.
Fig. 2 logic controller principle schematic.
The specific embodiment
As shown in Figure 1, alkali recovery boiler chute 5, it is a kind of non-direct contact type cooling device, and a passage that supplies high-temp liquid to flow through can be provided, to prevent high-temp liquid equipment itself be burnt out, and is routine techniques.The cooling water inlet pipe of alkali recovery boiler chute 5 connects UNICOM's desalination cooling water supply pipe 1, and desalination cooling water supply pipe 1 is provided with into water water temperature detector 2, and water inlet water temperature detector 2 is a platinum resistance thermometer sensor; Desalination cooling water supply pipe 1 and desalination cooling water water source UNICOM.Desalination cooling water water source can be a water tank.Desalination cooling water supply pipe 1 is provided with flow control valve 3 and stop valve 4.The cooling water outlet pipe of alkali recovery boiler chute 5 is provided with water outlet water temperature detector 6 and pressure measuring instruments 7.Water outlet water temperature detector 6 is a platinum resistance thermometer sensor.
The cooling water outlet pipe of alkali recovery boiler chute 5 is connected UNICOM with water pump 8.Water pump 8 adopts two of parallel connection, and one is the work water pump, and another is a reserve pump.Water pump 8 outlet conduits 15 parallelly connected first outlet conduits 16 and second outlet conduit 17 that is used for boiler is replenished preheating water; The outlet pipe 15 of water pump 8 is provided with the conductance instrument 9 that is used to detect heat exchange desalination cooling water electrical conductivity afterwards;
First outlet conduit 16 is provided with first control valve 13 and second stop valve 18; After first outlet conduit 16 passes through second stop valve 18 and first control valve 13, reclaim or administer discharging 14 UNICOMs with the desalination cooling water.
Second outlet conduit 17 is provided with second control valve 11 and the 3rd stop valve 19; Second outlet conduit 17 is through the 3rd stop valve 19 and second control valve 11 and boiler feedwater pipeline 12 UNICOMs.
Original state before system's operation is following: control valve 3 standard-sized sheets, stop valve 4 are opened, stop valve 18 is opened, stop valve 19 is opened, water pump 8 starts, first control valve 13 is opened, second control valve 11 is closed, logic controller 10 is closed.In use; The chute cooling water gets into whole system from the desalination water source through desalination cooling water supply pipe 1; Water inlet water temperature detector 2 is measured cooling water temperature and is not more than 30 ℃; Aperture with control valve 3 slowly turns down then, stops to regulate control valve 3 when the measurement numerical value of water outlet water temperature detector 6 is not more than 60 ℃; The desalination cooling water is implemented cooling to alkali recovery boiler chute;
Claims (7)
1. an alkali recovery boiler chute cooling water heat utilizes method, it be with the desalination cooling water implement through alkali recovery boiler chute after to the chute cooling, detect the desalination cooling electrical conductivity of water after the heat exchange; When the cooling of the desalination after heat exchange electrical conductivity of water is not more than setting value, the desalination cooling water after the described heat exchange is transported to boiler, boiler is replenished preheating water; When the desalination after the heat exchange cools off electrical conductivity of water greater than setting value, the desalination cooling water after the described heat exchange is reclaimed or administers discharging.
2. alkali recovery boiler chute cooling water heat utilizes method according to claim 1, it is characterized in that the water temperature of desalination cooling water is not more than 30 ℃; The water temperature of the desalination cooling water after the heat exchange is not more than 60 ℃.
3. alkali recovery boiler chute cooling water heat utilizes method according to claim 1 or claim 2, it is characterized in that the water temperature control of heat exchange desalination cooling water afterwards realizes through control discharge.
4. an alkali recovery boiler chute cooling water heat utilizes system; It comprises alkali recovery boiler cooling chute; The cooling water inlet pipe of cooling chute connects UNICOM's desalination cooling water supply pipe; The outlet pipe of cooling chute connects UNICOM's water pump, it is characterized in that outlet conduit parallel connection first outlet conduit and second outlet conduit that is used for boiler is replenished preheating water of water pump; The outlet conduit of water pump is provided with the conductance instrument that is used to detect heat exchange desalination cooling water electrical conductivity afterwards; The output signal conveys of conductance instrument is to logic controller, and the output control signal of logic controller is transported to first control valve and second control valve of second outlet conduit on first outlet conduit respectively.
5. utilize system like the said alkali recovery boiler of claim 4 chute cooling water heat, it is characterized in that the desalination cooling water supply pipe is provided with the flow control valve and first stop valve.
6. utilize system like the said alkali recovery boiler of claim 4 chute cooling water heat, it is characterized in that establishing on the desalination cooling water supply pipe water inlet water temperature detector; The outlet pipe upper water-out water temperature detector of the heat-exchange device of alkali recovery boiler chute.
7. utilize system like the said alkali recovery boiler of claim 4 chute cooling water heat, it is characterized in that being connected with second stop valve on the pipeline of water inlet end of first control valve; Be connected with the 3rd stop valve on the pipeline of the water inlet end of second control valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210125397.8A CN102644913B (en) | 2012-04-25 | 2012-04-25 | Residual heat utilization method of cooling water for black liquor recovery boiler chute and system thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210125397.8A CN102644913B (en) | 2012-04-25 | 2012-04-25 | Residual heat utilization method of cooling water for black liquor recovery boiler chute and system thereof |
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| Publication Number | Publication Date |
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| CN102644913A true CN102644913A (en) | 2012-08-22 |
| CN102644913B CN102644913B (en) | 2014-08-20 |
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| CN201210125397.8A Active CN102644913B (en) | 2012-04-25 | 2012-04-25 | Residual heat utilization method of cooling water for black liquor recovery boiler chute and system thereof |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0539914A (en) * | 1991-08-02 | 1993-02-19 | Mitsubishi Heavy Ind Ltd | Soda recovery boiler |
| FI19991933A (en) * | 1999-09-10 | 2001-03-10 | Kvaerner Pulping Oy | Arrangement in a soda pan |
| CN201795687U (en) * | 2009-12-22 | 2011-04-13 | 杭州锦江集团有限公司 | System for recycling alumina heat of roaster fluidized bed |
| CN202012018U (en) * | 2011-01-24 | 2011-10-19 | 云南云景林纸股份有限公司 | High-efficiency cooling fusant chute |
| CN102230292A (en) * | 2011-06-23 | 2011-11-02 | 中国轻工业武汉设计工程有限责任公司 | Circulation cooling device for chute of soda recovery furnace |
-
2012
- 2012-04-25 CN CN201210125397.8A patent/CN102644913B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0539914A (en) * | 1991-08-02 | 1993-02-19 | Mitsubishi Heavy Ind Ltd | Soda recovery boiler |
| FI19991933A (en) * | 1999-09-10 | 2001-03-10 | Kvaerner Pulping Oy | Arrangement in a soda pan |
| CN201795687U (en) * | 2009-12-22 | 2011-04-13 | 杭州锦江集团有限公司 | System for recycling alumina heat of roaster fluidized bed |
| CN202012018U (en) * | 2011-01-24 | 2011-10-19 | 云南云景林纸股份有限公司 | High-efficiency cooling fusant chute |
| CN102230292A (en) * | 2011-06-23 | 2011-11-02 | 中国轻工业武汉设计工程有限责任公司 | Circulation cooling device for chute of soda recovery furnace |
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| Publication number | Publication date |
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| CN102644913B (en) | 2014-08-20 |
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Effective date of registration: 20170606 Address after: At the junction of two road and 430000 Industrial District Ho Lake Street in Hubei province Wuhan city Jiangxia District Bridge Patentee after: Wuhan Wu pan Energy Engineering Co., Ltd. Address before: 430070 Hubei Province, Wuhan city Wuchang District Wuluo Road No. 586 Patentee before: Wuhan Engineering Technology Co.,Ltd,Wuhan Boiler Group. |
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